參數(shù)資料
型號: LTC2158CUP-14#PBF
廠商: Linear Technology
文件頁數(shù): 8/28頁
文件大?。?/td> 0K
描述: IC ADC DUAL 14BIT 310M 64-QFN
標準包裝: 40
位數(shù): 14
采樣率(每秒): 310M
數(shù)據(jù)接口: 并聯(lián),串行,SPI
轉(zhuǎn)換器數(shù)目: 2
功率耗散(最大): 873mW
電壓電源: 模擬和數(shù)字
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 64-WFQFN 裸露焊盤
供應商設備封裝: 64-QFN(9x9)
包裝: 管件
輸入數(shù)目和類型: 2 個差分
配用: DC1371A-ND - BOARD USB DATA ACQUISITION HS
LTC2158-14
16
215814f
applicaTions inForMaTion
Programmable LVDS Output Current
The default output driver current is 3.5mA. This current
can be adjusted by serially programming mode control
register A3 (see Table 3). Available current levels are
1.75mA, 2.1mA, 2.5mA, 3mA, 3.5mA, 4mA and 4.5mA.
Optional LVDS Driver Internal Termination
In most cases, using just an external 100 termination
resistor will give excellent LVDS signal integrity. In addi-
tion, an optional internal 100 termination resistor can
be enabled by serially programming mode control register
A3. The internal termination helps absorb any reflections
caused by imperfect termination at the receiver. When the
internal termination is enabled, the output driver current
is doubled to maintain the same output voltage swing.
Overflow Bit
The overflow output bit (OF) outputs a logic high when
the analog input is either overranged or underranged. The
overflow bit has the same pipeline latency as the data bits.
The OF output is double data rate; when CLKOUT+ is low,
channel A’s overflow is available; when CLKOUT+ is high,
channel B’s overflow is available.
Phase Shifting the Output Clock
To allow adequate set-up and hold time when latching the
output data, the CLKOUT+ signal may need to be phase
shifted relative to the data output bits. Most FPGAs have
this feature; this is generally the best place to adjust the
timing.
Alternatively, the ADC can also phase shift the CLKOUT+/
CLKOUTsignals by serially programming mode control
register A2. The output clock can be shifted by 0°, 45°,
90°, or 135°. To use the phase shifting feature the clock
duty cycle stabilizer must be turned on. Another con-
trol register bit can invert the polarity of CLKOUT+ and
CLKOUT, independently of the phase shift. The combina-
tion of these two features enables phase shifts of 45° up
to 315° (Figure 11).
Figure 11. Phase Shifting CLKOUT
CLKOUT+
D0-D13, OF
PHASE
SHIFT
45°
90°
135°
180°
225°
270°
315°
CLKINV
0
1
CLKPHASE1
MODE CONTROL BITS
0
1
0
1
CLKPHASE0
0
1
0
1
0
1
0
1
215814 F11
ENC+
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參數(shù)描述
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